Free material refers to music, sound effects, images and other assets distributed in a form that can be used at no charge. Being free of charge is not the same as being free to use for any purpose.
Where it fits
It is easy to use for personal projects, video, streaming and prototypes, but the conditions differ from one distributor to the next.
What to check when using it
Check commercial use, credit requirements, modification and redistribution, and save a copy of the terms of use.
Royalty-free describes a way of licensing and does not necessarily mean the material is free of charge.
